Abstract: In some embodiments, a computer system applies a time of day setting to a virtual environment. In some embodiments, the time of day setting is updated based on an event. In some embodiments, a computer system displays content in an expanded display mode. In some embodiments, computer systems join a communication session while maintaining display of respective environments. In some embodiments, a computer system moves a portal based on user movement. In some embodiments, computer systems share a virtual environment. Computer systems can display media with simulated lighting. Computer systems can share an environment. In some embodiments, a computer system selects a position relative to content. A computer system can present representations of communication session participants based on content. A computer system can present user interfaces to control visual appearances of an environment including media. Computer systems can change an appearance of an environment based on environmental modes.

Abstract: A tool for separating a gasketed pipe joint includes a body comprising a relatively thin member formed into a partially cylindrical shape having spaced-apart forward and rear edges; and an arcuate reinforcing collar attached to an outer surface of the body adjacent the rear edge. A driving apparatus for the tool includes a first driving ring adapted to be mounted around one of the pipes and sized to bear against the gasket release tool; a second driving ring adapted to be mounted around the other one of the pipes and sized to bear against the socket; and apparatus for drawing the first and second driving rings together so as to drive the gasket release tool into a pipe joint.

Abstract: A fire or explosion detection arrangement has a housing with first and second adjacent radiation-transmitting windows. The first window includes a filter having a passband corresponding to a narrow predetermined wavelength band. A radiation sensor mounted within the housing receives radiation from a fire or explosion through the first window, the predetermined passband corresponding to a wavelength band within which a fire or explosion to be detected generates radiation. An external source generates testing radiation having wavelengths capable of passing through the second radiation transmitting window but not through the filter. This radiation is directed to the sensor. There, means (either the sensor itself or, for example, an FET which is provided to process the normal output of the sensor) responds to the level of the testing radiation and a circuit determines from this level whether the obscuration of the second window is excessive.

Abstract: A fire and explosion detection and suppression system protects a hangar within which may be stored jet aircraft whose engines may be run up particularly in the re-heat mode. Two radiation sensors are mounted within the hangar and detect for at least predetermined amounts of radiation of predetermined and different types (e.g. one sensor may be a UV sensor and the other may be an IR sensor). When they simultaneously detect sufficient radiation, they operate an AND gate. This fires off suppressor units. To prevent false alarms due to radiation emitted by a running jet engine or a jet engine running in re-heat mode, such a running jet engine is sensed by a transducer responsive to the emitted acoustic or vibrational energy. This blocks the AND gate.